[FEATURE]: Fallback models in configuration

[stickerdaniel]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

it would be great if users could specify multiple models in the config (opencode.jsonc / agent/*md) so that an array like

    "$schema": "https://opencode.ai/config.json",
    "default_agent": "plan",
    "model": [
        "anthropic/claude-opus-4-5",
        "google/antigravity-claude-opus-4-5",
        "github-copilot/claude-opus-4-5"
    ],

would be a valid config option.

Why?

• Users that dont have a specific provider connected have a fallback model
• Ideally, opencode detects if provider limits are reached and selects the other model as default when starting a new session
• This way you can continue using e.g. Opus 4.5 without switching the model manually through other providers even if Anthropic's ridiculous rate limits are reached.

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• [FEATURE]: Native Model Fallback / Failover Support #7602: [FEATURE]: Native Model Fallback / Failover Support - Directly addresses model fallback and switching between different models with automatic retry on rate limits
• [FEATURE]: Tool that lets the model switch models #8278: [FEATURE]: Tool that lets the model switch models - Discusses automating model selection with instructions

Feel free to ignore if none of these address your specific case.